Keyhole-guard.



C. A. BRICKLEY.

KEYHOLE GUARD. l

APPLICATION men SEPT. 21. 191s.

.Patented Jan. 28, 1919.

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1 o t M e u n al@ attoznea) CHARLES A. BRICKLEY, OF PROVIDENCE, RHODEISLAND.

KEYHOLE-GUARD.

Specification of Letters Patent.

Patented Jan. 28, 1919.

Application filed September 21, 1918. Serial No. 255,039.

To all whom it may concern.'

Be it known that I, CHARLES A. BRICKLEY, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented a new and useful Improvement in Keyhole-Guards, ofwhich the following is a specification.

This invention relates to certain new and useful improvements in a keyhole guard, which is insertible in the key hole and lockable therein,the principal object residing in the improved and novel construction andthe manner of forming and assembling the parts into a simple and compactdevice.

The inventiony consists of a housing or casing stamped from sheet metalwhich is bent or folded upon itself to form a cylindrical chamber and adepending wing, a key-barrel rotatable within the chamber of the casing,a retaining lug carried by the barrel for rotation from registry withthe wing into locking relation with the door,

and key-controlled means for locking the barrel against rotation withinits chamber.

Further, the invention is found in the features of construction and thearrangements and combinations of parts hereinafter described andclaimed, reference being had to the accompanying drawing wherein* Figure1 is a side elevation of the improved keyhole guard.

Fig. 2 is a transverse section thereof on line 2-2 of Fig. 1.

Fig. 3 is a similar view taken on line 3--3 of Fig. 1.

Fig. 4 is a plan view of the blank for the guard casing, the parts 8having been removed after the formation of the blank, and

Fig. 5 is an end elevation thereof.

Referring more in detail to the drawing, the numeral 1 designates theblank of sheet metal from which the casing or body is formed. Thisblank, while in its fiat condition, is stamped to divide it into acentral longitudinal portion 2 and bordering side portions 3. Thecentral portion consists of a narrow section and a wide section which,when rolled or bent into final shape, form two cylinders 11 and 5interposed by one of a pair of beads 6 that include the larger cylinder5. Each side4 portion 3 is stamped to provide a series ofsemi-cylindrical raised portions 7 which extend in parallelism from thecentral portion, within the beads 6, to the edge of the side, the raisedportions 7 of one series being alined with those of the opposite serieswhereby when the blank assumes its final shape, the two series willoppose and supplement one another in forming a like member ofpin-receiving cylindrical chambers. The side portions are also providedwith registrable cutouts or openings 8. These various shapes areexpeditiously performed by one or two simple stamping operations whilethe blank is in its flat condition. v

The final shaping operation on the blank resides in bending it uponitself to form the cylindrical chambers /1 and 5 and a depending wingpart, the latter formed by bringing the sides 3 into fiat contactingrelation and soldering or otherwise securing them.

A barrel 9 is rotatably mounted in chamber 5 and has a stem extension 10operating into cylinder l for supporting the retaining lug or latch 11in the opening 8. The barrel 9 is provided with a key slot 12 andestablishing communication between the latter and the pin chambers 7 aretransverse bores 18. Operable in these bores and chambers are upper andlower sets of coperating locking pins 14: and l5 which are yieldablysupported on coiled springs 16 within the chambers 7 the lower ends ofthe latter being closed as by plugs 17.

In operation with the key 18 in the slot 12 and the retaining latch 11alined with the wing 3 in its opening 8, the guard device is inserted inthe key hole of a door, or the like, in a manner similar to inserting akey. When properly disposed. the key 18 is turned to rotate theretaining latch 11 into interlocking relation with a fixed part of thedoor lock whereby the guard is firmly fixed against unauthorizedremoval. The key hole is thus securely closed against the insertion of atool or skeleton key by which the door lock might otherwise be renderedinoperative.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent iss A key hole guard comprising a casingconstructed from a sheet of metal bent to form an inner cylinder and .alarger and alined outer cylinder joined thereto by a bead-like shoulder,the edge portions of the sheet being brought together to provide adepending web, said edge portions being tinted to form pin chambersleadin through the web from the outer cylinder, p ugs closing the lowerends of the pin chambers to reinforce the saine, a barrel rotatablyfitting the outer cylinder and provided with a reduced stem extendingWithin the inner cylinder, said barrel having an axial key slot andradial bores leading therefrom :tor registry With the pin chambers,cooperating looking pins slidable in the bores of the barrel and the pinchambers of the Web, springs arranged on the plugs Within the chambersto expand against the pins, and a guard retaining lug carried radiallyby the barrel stein and extending through a peripheral opening formed inone side only of the inner barrel, said openingextending down into theunderlying web whereby the retaining l5 Copies of this patent may beobtained for ye eent each, by a'cldresng the Commissioner of atents,

Washington, D. C. l

